钢筋抗浮锚杆承载特性现场试验与数值仿真

Field Test and Numerical Simulation of Bearing Capacity of Steel Reinforcement Anti-floating Anchor

通过现场试验以及ABAQUS数值模拟相结合的方法,探讨了风化岩地基中全长黏结钢筋抗浮锚杆的承载性能和荷载传递特征。结果表明:风化岩地基中的抗浮锚杆承载力高,上拔量小,能够满足工程需求。锚杆杆体荷载-位移曲线、剪应力、轴应力分布规律的模拟结果与现场试验结果具有较高的吻合度,说明用ABAQUS软件模拟钢筋抗浮锚杆的承载特性是可行的,具有较强的适用性;同时,还得到了现场试验较难得到的锚固砂浆和周围岩土体的应力分布规律,明确了钢筋抗浮锚杆受荷后的影响范围和锚固体的力学特性,弥补了现场试验的不足。

The anchoring performance and force transfer mechanism of full-bonding anti-floating anchor socket into rock were studied by field tests and ABAQUS numerical simulation.The results show that the anti-floating anchor performed well in bearing capacity,with less pull-out settlements,which could meet the construction design.The simulation results of the load-slip curve,shear stress and axial force distribution of the anchor are quite consistent with the field test results,showing the feasibility and applicability of the ABAQUS software to simulate the bearing characteristics of reinforced concrete anti-floating anchor.At the same time,the stress distribution of anchored mortar and surrounding rock,which is difficult to be measured in field test,are obtained by the numerical simulation.The area affected by the anti-floating anchors and the mechanical properties of the anchor under loading are determined,providing supplement for the further field test.